# Design of an RRAM-Based Joint Model for Embedded Cellular Smartphone Self-Charging Device

## TL;DR

This paper proposes an RRAM-based self-charging device for smartphones using magnetic induction to convert mechanical energy into electrical energy.

## Contribution

A novel RRAM-based hybrid memristor model with a permanent magnet for embedded self-charging devices is introduced.

## Key findings

- The proposed 1T2R design retains data after power-off and enables fast power transitions.
- The magnet-based device can generate sufficient voltage to charge a smartphone battery.
- The design supports eco-friendly energy harvesting for portable electronics.

## Abstract

With the development of embedded electronic devices, energy consumption has become a significant design issue in modern systems-on-a-chip. Conventional SRAMs cannot maintain data after powering turned off, limiting their use in applications such as battery-powered smartphone devices that require non-volatility and no leakage current. RRAM devices are recently used extensively in applications such as self-charging wireless sensor networks and storage elements, owing to their intrinsic non-volatility and multi-bit capabilities, making them a potential candidate for mitigating the von Neumann bottleneck. We propose a new RRAM-based hybrid memristor model incorporated with a permanent magnet. The proposed design (1T2R) was simulated in Cadence Virtuoso with a 1.5 V power supply, and the finite-element approach was adopted to simulate magnetization. This model can retain the data after the power is off and provides fast power on/off transitions. It is possible to charge a smartphone battery without an external power source by utilizing a portable charger that uses magnetic induction to convert mechanical energy into electrical energy. In an embedded smartphone self-charging device this addresses eco-friendly concerns and lowers environmental effects. It would lead to the development of magnetic field-assisted embedded portable electronic devices and open the door to new types of energy harvesting for RRAM devices. Our proposed design and simulation results reveal that, under usual conditions, the magnet-based device provide a high voltage to charge a smartphone battery.